package club.banyuan.collection.demo1;

import java.util.HashSet;
import java.util.Set;

/**
 * @author edz
 * @version 1.0
 * @date 2020/12/2 下午5:07
 */
public class Grade {
    public static void main(String[] args) {
        Set<String> set = new HashSet<>();

    }
}
